Bedienungsanleitung JBL Conceal Serie (Seite 6 von 9) (Englisch)

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8. Sand Smooth

• Sanding is the last important step before the painting begins. This can make or break the quality of the installation.

• When sanding, imperfections in the application of the joint compound may appear. If so, additional joint compound

and sanding may be needed to create a seamless transition (See Figure 9).

• Best practice may include the use of a ashlight to shine sheer light down the wall or ceiling in order to identify high/

low spots in the nish work.

9. Paint and Finish

• Once sanding is complete the face panel is ready for painting (See Figure 10).

• Prime the speaker and surrounding areas with an adhesive type of water based primer.

• Light “orange peel” texture, light knock-down texture, wallpaper, veneer, or level 5 nish may be applied.

• Heavy knock down or trowel nishes are not recommended. Conceal series speaker face panels are engineered for

optimum audio performance with no more than 1/16” (2mm) of any material applied to the surface of the speaker.

Figure 10

REPAIR & REUSE

Hairline Cracking Causes and Repair

JBL Conceal Invisible Loudspeakers are designed specifically to prevent cracking of the wallboard finish around the

perimeter of the speaker during normal use. This is accomplished by dampening the frame of the speaker from vibrations

caused during playback. By isolating the frame from vibration, movement between the speaker and surrounding wallboard

is minimized which eliminates the opportunity for cracking to occur.

If ne hairline perimeter cracking does occur soon after installation, it is most commonly associated with insu󰀩cient drying

time of the base coat of joint compound. It is critical that each coat of joint compound is completely dry when a subsequent

layer is applied. Any moisture retained in the base layer will continue to slowly dry and shrink slightly under the subsequent

layers of joint compound. This shrinking process may produce delayed hairline cracking.

This type of cracking does not typically appear at the seam between the wallboard and speaker, rather at the chamfered

edge of the speaker diaphragm about ¾" (19 mm) inward from the edge of the speaker frame. Cracking may not be visible

right away as it may take days or weeks for the base coat to completely dry.

The best way to prevent this type of cracking is to allow additional drying time for the base coat of joint compound,

especially in areas where the construction environment is cold or damp. THE USE OF HOT MUD OR CHEMICALLY

CURING JOINT COMPOUNDS IS NOT ADVISED.

Repairing this type of hairline perimeter cracking should be done with standard wall-nishing techniques:

• For smooth wall/ceiling nishes, repair usually consists of excavation of the crack using a sharp tool such as the corner

of a chisel or utility knife. Using the sharp tool, widen the crack to 1/16" to ⅛" (2-3 mm). Next ll/skim the a󰀨ected area

with lightweight joint compound or spackle. Use air-dry type compounds only. Once completely dry, sand the area

smooth at and re-paint.

• For textured wall/ceiling nishes, or nishes less critical, it is possible to repair the cracks with a water-based paintable

caulk. Using a putty knife or ngertip, push the caulk into the crack. Use a damp cloth to wipe away the excess. Allow

to dry and then paint.

TROUBLESHOOTING

Sound cuts out or is distorted

JBL Conceal invisible loudspeakers contain self-resetting limit switches for protection against excessive amplier output.

These switches respond to the heat generated from the excessive volume output and will be triggered before output

reaches levels that could damage the speaker. Sound quality may be greatly reduced as the limit is approached but the

speaker and amplier will not be damaged. Once fully triggered, audio output will cease until the excessive volume has

been corrected and the limit switch returns to its normal operational state (approx. 5-10 minutes).

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